Perko Clam Shell Ventilator, Polished Stainless Steel

Overview

The Perko 0315 is a polished stainless steel clam shell ventilator for covering and protecting small ventilation openings on boats. Its low-profile shell shape helps shield an opening from direct spray while still allowing air to pass through, making it useful on decks, cabins, lockers, transoms, and other exterior areas where a clean metal vent cover is needed.

This ventilator is offered in two base sizes: 1-5/8 x 1-1/2 inch with a 7/16 inch opening height and 7/8 inch opening width, and 2 x 2 inch with a 9/16 inch opening height and 1-7/8 inch opening width. The polished stainless steel finish suits visible installations where corrosion resistance and a neat appearance matter in a saltwater setting.

Key features

• Polished stainless steel construction for exposed marine locations where the vent cover may see salt air, spray, sun, and routine washdowns.
• Clam shell shape helps cover small air openings, cable exits, or similar cutouts while keeping the installation low on the surface.
• Available in two base sizes so the cover can be matched to the opening and surrounding mounting area.
• Opening dimensions are specified for fit checks before drilling or replacing an existing clam shell vent.
• Uses common marine screw sizes, with #4 screws for the smaller version and #6 screws for the larger version.

Variants

This product is offered in two stainless steel configurations that differ by base size, opening size, and screw size.

Both variants share the same polished stainless steel clam shell style, so the main decision is the footprint needed for the opening and the available mounting space.

• 0315DP1STS, Dimensions Base 1-5/8 x 1-1/2-Inch. This smaller footprint has a 7/16 inch opening height, 7/8 inch opening width, and uses #4 screws, making it suited to tighter exterior mounting areas.
• 0315DP2STS, Dimensions Base 2x2-Inch. This larger footprint has a 9/16 inch opening height, 1-7/8 inch opening width, and uses #6 screws, giving more coverage where the cutout or surface area calls for it.

Installation and fit

Before installation, compare the base dimensions and opening dimensions with the existing cutout or planned vent location. The shell should cover the opening fully while leaving enough flat surface around it for the fasteners to seat properly.

For exterior use, mount the ventilator with the opening oriented to reduce direct water entry based on the boat location and airflow path. Bedding the fastener holes and contact surface with a suitable marine sealant helps protect the deck, cabin side, or transom surface from water intrusion.

Use cases on board

This vent cover is a practical match for small ventilation points on lockers, cabin panels, cockpit areas, and other exterior surfaces where a simple stainless cover is preferred over plastic or painted hardware. It also works well for replacement jobs where the existing clam shell vent footprint matches one of the listed sizes.